A research instrument is a tool used to collect and analyze data in research. Some common examples include interviews, questionnaires, surveys, and checklists. Interviews can be structured, unstructured, or semi-structured and involve asking participants questions to obtain qualitative data. Surveys are similar but are often distributed as paper or online forms rather than in-person. Observation is another instrument that involves watching people interact to collect data in a controlled or uncontrolled environment. Research instruments help simplify the process of conducting market research and learning about customer behavior.